CN1776495A - Reflection sheet, backlight assembly and display device - Google Patents

Reflection sheet, backlight assembly and display device Download PDF

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Publication number
CN1776495A
CN1776495A CNA2005101149601A CN200510114960A CN1776495A CN 1776495 A CN1776495 A CN 1776495A CN A2005101149601 A CNA2005101149601 A CN A2005101149601A CN 200510114960 A CN200510114960 A CN 200510114960A CN 1776495 A CN1776495 A CN 1776495A
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CN
China
Prior art keywords
light source
heat dissipating
dissipating layer
backlight assembly
receiving member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2005101149601A
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Chinese (zh)
Inventor
郑斗焕
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of CN1776495A publication Critical patent/CN1776495A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/60—Temperature independent

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The present invention provides a reflection sheet improving a display quality, a backlight unit including the reflection sheet and a display device including the backlight unit is provided. The reflection sheet includes a reflection layer and a heat emission layer. The reflection layer reflects a light supplied from a light source. The heat emission layer contacts the reflection layer to emit a heat generated from the light source. The heat emission insulates the light source from the receiving member to suppress a leakage current of the light source.

Description

Reflection sheet, backlight assembly and display device
Based on 35U.S.C. § 119, the application requires the right of priority of the korean patent application submitted on November 16th, 2004 2004-93654 number, and its full content is hereby expressly incorporated by reference.
Technical field
The display device that the present invention relates to reflection sheet, has the backlight assembly of this reflection sheet and have this backlight assembly.More specifically, the present invention relates to improve the reflection sheet of display quality, the display device that has the backlight assembly of this reflection sheet and have this backlight assembly.
Background technology
The display device that is used for display image is developed widely.Liquid crystal indicator has such as advantages such as in light weight, thin thickness and low-power consumption.Therefore, liquid crystal indicator is widely used in the various application.
Liquid crystal indicator comprises backlight assembly and display panels.Backlight assembly provides the light that can make the liquid crystal indicator display image to display panels.Liquid crystal indicator can be divided into direct illumination type backlight assembly and peripheral type backlight assembly according to the position of light source.
The peripheral type backlight assembly has the lamp unit that is positioned on the light guide plate side.The peripheral type backlight assembly is used for the small-sized LCD such as portable computer and desk-top computer.The peripheral type backlight assembly produces light equably and has very long serviceable life.In addition, to be used for very thin liquid crystal indicator be very favourable to the peripheral type backlight assembly.
A plurality of lamps are arranged in parallel around the bottom of direct illumination type backlight assembly.Because direct illumination type backlight assembly has a plurality of lamps that are used for providing to display panels light, thus direct illumination type backlight assembly need to be used to the LCD of the giant-screen of high brightness be very favourable.
Yet if the large-screen lc display device has direct type backlight assembly, the lamp around the bottom that is positioned at display panels produces excessive heat.Therefore, the internal temperature of receiving member rises.Heat damages the liquid crystal layer in the display panels.In addition, heat has reduced the brightness of lamp, makes the display quality of liquid crystal indicator worsen.
Fig. 1 is the curve map that the relative brightness that changes according to the temperature around a plurality of lamps that use traditional liquid crystal indicator is shown.With reference to Fig. 1, when temperature was about more than 45 ℃, the steam pressure of the mercury in the lamp changed.Therefore, the brightness of lamp reduces.
, need to be dissipated to the outside of lamp rapidly from the heat of the inside generation of lamp because the internal temperature of liquid crystal indicator raises or because the problem that the inside and outside temperature difference of lamp causes in order to solve.The heat that produces from lamp can be delivered to reflection sheet.Then, the heat transferred that is delivered to reflection sheet makes heat discharge from receiving member basically to the receiving member that comprises metal.
Yet because reflection sheet comprises synthetic resin, so the thermal conductivity of reflection sheet is very low basically.Therefore, be delivered to receiving member lentamente from the heat of lamp transmission, thereby heat can not give out from receiving member effectively.
In addition, the receiving member that is used to hold this lamp comprises metal, makes to produce stray capacitance between receiving member and lamp.Stray capacitance produces leakage current, thereby has reduced the brightness of lamp.
Summary of the invention
The invention provides a kind of reflection sheet, its can be effectively from distribute heat wherein and light source and receiving member are insulated.
The present invention also provides a kind of backlight assembly that comprises above-mentioned reflection sheet.
The present invention also provides a kind of display device that comprises above-mentioned backlight assembly.
According to exemplary embodiment of the present invention, reflection sheet comprises: the reflection horizon is used to reflect the light that provides from light source; And heat dissipating layer, be positioned on the surface in reflection horizon.Heat dissipating layer disperses the heat from light source.Heat dissipating layer suppresses the leakage of current of light source.
According to another exemplary embodiment of the present invention, heat dissipating layer comprises the potpourri of boron nitride, silit, magnesium oxide and any above-mentioned substance.
According to another exemplary embodiment of the present invention, heat dissipating layer comprise the graphite that is doped with no more than about 30% percentage by weight boron nitride, be doped with the graphite of no more than about 30% percentage by weight silit, be doped with the magnesium oxide and any potpourri of above-mentioned substance of the graphite of no more than about 30% percentage by weight.
According to another exemplary embodiment of the present invention, backlight assembly comprises light source, receiving member and reflecting element.Light source produces light.Receiving member is positioned at below the light source to hold light source.Reflecting element is between light source and receiving member.Reflecting element distributes the heat that produces from light source.Reflecting element is with light source and receiving member insulation.
According to another exemplary embodiment of the present invention, display device comprises display unit and backlight assembly.The display unit display image.Backlight assembly comprises light source, receiving member and reflecting element.Light source produces the light that is used for display image.Receiving member holds light source.Reflecting element distributes the heat that produces from light source.Reflecting element is with light source and receiving member insulation.
According to another exemplary embodiment of the present invention, reflection sheet is scattered light and with the insulation of light source and storage container equably, thereby can improve emission efficiency.In addition, can suppress stray capacitance.Advantageously, reflection sheet can improve the brightness of light.
Description of drawings
By detailed description below in conjunction with accompanying drawing, of the present invention above-mentioned apparent with other advantages general, in the accompanying drawings:
Fig. 1 is the curve map that the exemplary embodiment of the relative brightness that changes according to the temperature around a plurality of lamps that use traditional liquid crystal indicator is shown;
Fig. 2 is the decomposition diagram that illustrates according to the exemplary embodiment of backlight assembly of the present invention;
Fig. 3 is the cross-sectional view along I-I ' line intercepting shown in Figure 2;
Fig. 4 is the cross-sectional view that the exemplary embodiment of reflection sheet shown in Figure 2 is shown;
Fig. 5 A is the synoptic diagram of exemplary embodiment that the heat distribution of the traditional backlight assembly that comprises the traditional reflective thin slice is shown;
Fig. 5 B illustrates the synoptic diagram that has according to the exemplary embodiment of the heat distribution of the backlight assembly of reflection sheet of the present invention; And
Fig. 6 is the decomposition diagram that illustrates according to the exemplary embodiment of liquid crystal indicator of the present invention.
Embodiment
The present invention is described below with reference to accompanying drawings more all sidedly, embodiments of the invention shown in the drawings.Yet the present invention can different ways realizes and is not limited to embodiment described here; On the contrary, provide these embodiment, concerning those skilled in the art, the disclosure more comprehensively and complete and cover scope of the present invention fully.In the accompanying drawings, for clarity sake, enlarged the thickness in layer and zone.In the whole accompanying drawing, identical label refers to components identical.Be to be understood that when mention such as the element of layer, zone and substrate other element " on " time, be meant can be located immediately on another element, also may have element betwixt.
Although should be appreciated that at this and may use the term first, second, third, etc. to describe different elements, parts, zone, layer and/or part, these elements, parts, zone, layer and/or part can not be confined to these terms.These terms only are used for an element, parts, zone, layer or part are distinguished mutually with other zones, layer or part.Therefore, under the situation that does not deviate from aim of the present invention, first element hereinafter described, assembly, zone, layer or part can be called second element, assembly, zone, layer or part.
For convenience of explanation, this may use such as " ... under ", " ... following ", " following ", " ... top " and the spatial relationship term of " top " etc., to describe the element described in figure or the relation of mechanism and another element or mechanism.Should be appreciated that the direction of in figure, describing that the spatial relationship term will be included in the different directions of the device in use or the operation.For example, if the device in the flipchart, then be described as be in other elements or mechanism " following " or " under " element will be oriented in other elements or mechanism's " top ".Therefore, exemplary term " ... following " be included in above and below direction.Device can be otherwise directed (revolve turn 90 degrees or in other directions) and can correspondingly being explained by spatial relationship descriptor as used herein.
Term only is used to describe specific embodiment rather than restriction the present invention as used herein.As used herein, " one " of singulative, " this " also comprise plural form, unless there is other clearly to indicate in the literary composition.Should further understand, when in present specification, using term " to comprise " and/or when " comprising ", it refers to and has certain feature, integer, step, operation, element and/or parts, does not exist or additional one or more other feature, integer, step, operation, element, parts and/or its combination but do not get rid of.
In the literary composition by describing embodiments of the invention in conjunction with the cross-sectional view that schematically shows the preferred embodiments of the present invention (and intermediate structure).Similarly, for example can obtain different shape by manufacturing technology and/or tolerance produced.Thus, embodiments of the invention should not be confined to the given shape in the zone that goes out shown here, and should comprise the different shape that is produced in for example making.
Fig. 2 is the decomposition diagram that illustrates according to the exemplary embodiment of backlight assembly of the present invention.Fig. 3 is the cross-sectional view along I-I ' line intercepting shown in Figure 2.
With reference to Fig. 2 and Fig. 3, backlight assembly 100 comprises: lamp unit 200, scatter plate 300, first receiving member 400 and second receiving member 500.Backlight assembly 100 can also comprise otpical leaf 600 and reflection sheet 700.
Lamp unit 200 has a plurality of lamps 212 and first and second outer electrodes 214 and 216.First and second outer electrodes 214 and 216 all be positioned at lamp 212 two ends around.In the exemplary embodiment, lamp 212 can be the external electrode fluorescent lamp (EEFL) with first and second outer electrodes 214 and 216.In optional embodiment, lamp unit 200 can be cold-cathode fluorescence lamp (CCFL).
As shown in Figure 3, the lamp 212 of generation light is essentially tubulose.In other exemplary embodiment, lamp 212 can have difformity rather than the tubulose such as light emitting diode (LED), or is suitable for the Any shape of purpose described here.
The discharge gas (not shown) can be provided in lamp 212.First and second outer electrodes 214 and 216 can have conductive material.First and second outer electrodes 214 and 216 partly surround the end of lamp 212.In response to first and second driving voltages that are applied to lamp 212 by first and second outer electrodes 214 and 216, lamp 212 produces light.
Lamp unit 200 can have first lamp socket 220 and second lamp socket 230.A but end of first lamp socket, 220 fixed lights 212.But the other end of second lamp socket, 230 fixed lights 212.
First lamp socket 220 can have first fixed head 222 and a plurality of first clamping part 224.First clamping part 224 is outstanding from first fixed head 222.Each first outer electrode 214 combines an end with fixed light 212 with each first clamping part 224.In addition, first fixed head 222 is connected with first clamping part 224, makes the fixed head 222 of winning provide first driving voltage to first clamping part 224.In the exemplary embodiment, a plurality of auxiliary clamping part (not shown) can be outstanding from first fixed head 222.Auxiliary clamping part can prevent or reduce moving by the fixing lamp 212 of first clamping part 224 effectively.In optional exemplary embodiment, auxiliary clamping part can contact the end of lamp 212.
Second lamp socket 230 that is used for fixing the other end of lamp 212 has second fixed head 232 and a plurality of second clamping part 234.Second clamping part 234 is outstanding from second fixed head 232.Each second outer electrode 216 combines the other end with fixed light 212 with each second clamping part 234.In addition, second fixed head 232 is connected with second clamping part 234, makes second fixed head 232 to provide second driving voltage to second clamping part 234.In the exemplary embodiment, the above-mentioned a plurality of auxiliary clamping part that is used for first lamp socket 220 can be outstanding from second fixed head 232.Auxiliary clamping part can prevent or reduce moving by the fixing lamp 212 of second clamping part 234 effectively.In alternate exemplary embodiment, auxiliary clamping part can contact the end of lamp 212.
In a further exemplary embodiment, the insulating part (not shown) that can include but not limited to insulating material can be positioned at following, second lamp socket 230 following of end lamp socket 220 or both below.Insulating part is effectively with first lamp socket 220 and second lamp socket 230 and 500 insulation of second receiving member.
With reference to Fig. 2 and Fig. 3, scatter plate 300 be positioned at lamp unit 200 above.First light that produces from lamp 212 incides on the scatter plate 300.Then, scatter plate 300 scatterings first light, thus first light can be changed second light that becomes to have uniform luminance.After this, second light penetrates from scatter plate 300.
First receiving member 400 be positioned at scatter plate 300 below.First receiving member 400 can comprise first model framework 410 and second model framework 420.
First model framework 410 be located immediately at first lamp socket 220 above.Second model framework 420 be located immediately at second lamp socket 230 above.
Referring again to Fig. 2 and Fig. 3, the width of the bottom of first model framework 410 is basically greater than the width on the top of first model framework 410.First outer electrode 214 can be contained in first model framework 410 fully.First model framework 410 has the first side wall 414, scalariform portion 416 and second sidewall 418.The first side wall 414 has the recess 412 that lamp 212 is inserted wherein.Scalariform portion comprises from the top of the first side wall 414 makes scalariform portion support scatter plate 300 and otpical leaf 600 basically to the first basic horizontal portion that second sidewall 418 extends.Scalariform portion 416 as shown in Figure 2 also comprises from the top of second sidewall 418 to second basic horizontal portion that first horizontal part extends and the basic vertical component effect between first and second horizontal parts.Second sidewall 418 vertically extends to second receiving member 500 from scalariform portion.
First model framework 410 has first spatial accommodation that is limited by the first side wall 414, scalariform portion 416 and second sidewall 418.First lamp socket 220 is contained in first spatial accommodation.
Second model framework 420 is substantially the same with first model framework 410.Therefore, will omit further detailed description.Second model framework 420 has second spatial accommodation therein.Second lamp socket 230 is contained in second spatial accommodation.
Be positioned at the lamp unit 200 second following receiving members 500 and have bottom 510, the first side wall portion 520, second side wall portion 530, the 3rd side wall portion 540 and the 4th side wall portion 550.The first, second, third and the 4th side wall portion 520,530,540 and 550 510 substantially perpendicularly extends to scatter plate 300 from the bottom.Bottom the 510 and first, second, third and the 4th side wall portion 520,530,540 and 550 limits together and holds the district.Lamp unit 200 and reflection sheet 700 are contained in and hold in the district.First model framework 410 contacts with the first side wall portion 520 of second receiving member 500.Second model framework 420 contacts with second side wall portion 530 of second receiving member 500.In the exemplary embodiment, second receiving member 500 can include but not limited to metal.Second receiving member 500 is called the chassis hereinafter.
The first side wall portion 520 has first side 522, end face 524 and second side 526.510 extend to scatter plate 300 from the bottom first side 522.End face 524 extends and parallel with bottom 510 basically from first side 522 to second side 526.Extend and parallel, relative with first side 522 with first side 522 basically to bottom 510 from end face 524 second side 526.Second side wall portion 530 relative with the first side wall portion 520 is substantially the same with the first side wall portion 520.Therefore, will omit further explanation in detail.
With reference to Fig. 2 and Fig. 3, otpical leaf 600 is positioned on the scatter plate 300.Otpical leaf 600 has improved and has had the optical characteristics of second light of uniform luminance basically.In the exemplary embodiment, otpical leaf 600 can have scattering thin slice 610 and prism thin slice 620.Scattering thin slice 610 can be positioned on the scatter plate 300.Scattering thin slice 610 is second light that penetrates from scatter plate 300 of scattering equably.Prism thin slice 620 can be positioned on the scattering thin slice 610.Prism thin slice 620 converges second light that passes scattering thin slice 610, thereby increases the brightness of second light effectively.
Reflection sheet 700 is positioned at below the lamp unit 200.Reflection sheet 700 reflections make light can incide on the scatter plate 300 from light lamp 212 ejaculations, process reflection sheet 700 of lamp unit 200.In the exemplary embodiment, reflection sheet 700 can have sandwich construction, makes the heat that produces from lamp 212 disperse fully, is delivered to chassis 500 then.Reflection sheet 700 can have reflection horizon 710, heat dissipating layer 720 and adhesion layer 730.In optional embodiment, reflection sheet 700 can cover third and fourth side wall portion 540 and 550.
Fig. 4 is the cross-sectional view that the exemplary embodiment of reflection sheet shown in Figure 2 is shown.
As shown in Figure 4, reflection sheet 700 has reflection horizon 710.Reflection horizon 710 will reflex to reflection horizon 710 and be positioned at heat dissipating layer 720 below the reflection horizon 710 from the light that lamp shown in Figure 2 212 penetrates, this heat dissipating layer is used to distribute the heat from lamp 212 generations.
Reflection horizon 710 can include but not limited to have the polyethylene terephthalate (PET) of reflection characteristic.The light that reflection horizon 710 will be penetrated from the lamp 212 of lamp unit 200 reflexes to reflection horizon 710, makes light can incide (referring to Fig. 2) on the scatter plate 300.Advantageously, can improve the utilization factor of light.In the exemplary embodiment, the reflection horizon 710 that comprises PET can be coated on the heat dissipating layer 720.
Heat dissipating layer 720 can disperse from the heat of lamp 212 generations, thereby can be effectively from heat dissipating layer 720 distribute heats.In addition, heat dissipating layer 720 can make chassis 500 and lamp 212 electrical isolations, thus the stray capacitance that suppresses or reduce effectively to cause owing to leakage current.
Heat dissipating layer 720 can comprise having basic high heat conductance and high-resistance substantially material simultaneously.In the exemplary embodiment, this material can be boron nitride (BN), silit (SiC) or magnesium oxide (MgO).These materials can use separately or use with its form of mixtures.In optional embodiment, graphite can be doped in the material with predetermined concentration.The percentage by weight of the graphite that contains in BN, SiC or MgO is not more than about 30%.
BN, SiC or MgO have high substantially thermal conductivity.The thermal conductivity of BN is about 400W/mK.The thermal conductivity of SiC is about 300W/mK.The thermal conductivity of MgO is about 200W/mK.
In addition, BN, SiC or MgO have high substantially resistivity.The resistivity of BN is about 2 * 10 14Ohmcm.The resistivity of SiC is about 10 5Ohmcm.The resistivity of MgO is about 10 9Ohmcm.
Advantageously, the heat dissipating layer 720 that comprises above-mentioned material can disperse equably from first and second outer electrodes 214 of lamp 212 and the heats of 216 generations.Then, heat promptly is delivered to chassis 500.In addition, heat dissipating layer 720 can be with chassis 500 and lamp 212 electrical isolations.
The thermal conductivity of graphite is high relatively.But the resistivity of graphite is low relatively.For example, have at heat sink 720 under the material situation of the graphite that mixes with predetermined concentration, heat dissipating layer 720 can have the resistivity that is higher than graphite basically.Advantageously, heat dissipating layer 720 can be effectively with lamp 212 and chassis 500 insulation.
Reflection horizon 710 can have the thickness of about 0.01 millimeter (mm) to about 0.7 millimeter (mm).Heat dissipating layer 720 can have the thickness of about 0.3mm to about 0.99mm.In the exemplary embodiment, reflection horizon 710 can have the thickness of about 0.25mm, and heat dissipating layer 720 can have the thickness of about 0.75mm.Therefore, reflection sheet 700 can have the gross thickness of about 1mm.
With reference to Fig. 4, reflection sheet 700 comprises the adhesion layer 730 between reflection horizon 710 and heat dissipating layer 720.Adhesion layer 730 can be used for heat dissipating layer 720 is laminated to the lower surface in reflection horizon 710.By using adhesion layer 730, reflection horizon 710 and heat dissipating layer 720 can be integrally formed with one another.
Adhesion layer 730 can comprise sicker 732 and the bubble 734 of randomize in sicker 732.In the exemplary embodiment, bubble 734 can be formed by gas-development agent.Can use sicker 732 and comprise that the potpourri of gas-development agent forms adhesion layer 730.The light scattering that bubble 734 will penetrate from lamp 212 is to bubble 734.Advantageously, adhesive 730 can make reflection horizon 710 and heat dissipating layer 720 be integrally formed with one another.In addition, bubble 734 scattered lights are to improve the reflection of light characteristic.
Reflection sheet 700 is between lamp unit 200 and chassis 500.Reflection sheet 700 will reflex to reflection horizon 710 from the light that the bottom of lamp unit 200 is penetrated, and make light can incide on the scatter plate 300.
In addition, reflection sheet 700 is dispersed in first and second outer electrodes 214 of lamp 212 and 216 the heat that produces on every side.Then, reflection sheet 700 can be delivered to chassis 500 effectively with heat, disperses efficient thereby can increase.That is, the heat transferred that will produce from lamp 212 is to the reflection horizon 710 of reflection sheet 700.Then, the heat transferred that reflection horizon 710 is transmitted is to heat dissipating layer 720.Heat dissipating layer 720 is heat dispersing equably.With the bottom 510 of homodisperse heat transferred to chassis 500.Then, the heat that is delivered to the bottom 510 on chassis is distributed.
Because the heat dissipating layer 720 of reflection sheet 700 can comprise the material with basic high resistivity, thus lamp 212 can with chassis 500 electrical isolations.Advantageously, can suppress or reduce stray capacitance effectively.As a result, can reduce leakage current, thereby can keep the brightness of lamp 212 or brightness that reduction is slightly only arranged.
In addition, the adhesion layer 730 with bubble 734 is between reflection horizon 710 and heat dissipating layer 720, and light can carry out scattering by bubble 734 thus.Advantageously, being used in not being included in otpical leaf 600 improves under the auxiliary situation of the prism thin slice 620 of brightness of light, and the brightness of light is very high basically.In optional embodiment, can omit prism thin slice 620.
Fig. 5 A is the synoptic diagram of exemplary embodiment that the heat distribution of the traditional backlight assembly that includes the traditional reflective thin slice is shown.Fig. 5 B illustrates the synoptic diagram that has according to the exemplary embodiment of the heat distribution of the backlight assembly of reflection sheet of the present invention.
Shown in Fig. 5 A and Fig. 5 B, include according to the temperature in the zone, the right of the backlight assembly of reflection sheet of the present invention and compare low about 4 ℃ to 7 ℃ with the temperature in the zone, the right of the traditional backlight assembly that includes the traditional reflective thin slice. Outer electrode 214 and 216 one of them be positioned at the right zone around.
In addition, include according to the temperature of the left area of the backlight assembly of reflection sheet of the present invention and compare low about 3 ℃ to 4 ℃ with the temperature of the left area of the traditional backlight assembly that includes the traditional reflective thin slice.Another outer electrode be positioned at left area around.
As mentioned above, in exemplary embodiment according to the present invention, can be reduced in the left area around the outer electrode of backlight assembly and the temperature in zone, the right effectively.In addition, in the exemplary embodiment shown in Fig. 5 B, the degree that the temperature around the zone, the right descends may be higher than the degree that the temperature around the left area descends.Therefore, compare with the traditional backlight assembly shown in Fig. 5 A, backlight assembly can have more uniform temperature.
Fig. 6 is the decomposition diagram that the exemplary embodiment of liquid crystal indicator is shown.Backlight assembly in the liquid crystal indicator is identical with the backlight assembly shown in Fig. 2 to Fig. 4 basically.Therefore, will use identical label to represent and the same or analogous part of the part shown in Fig. 2 to 4, and will omit further and explain in detail.
With reference to Fig. 6, liquid crystal indicator comprises: backlight assembly 100 is used to provide light; Display unit 800 is used for by using the light that provides from backlight assembly 100 to come display image; And take over a business 900, be used for display unit 800 is fixed to backlight assembly 100.
Backlight assembly 100 has lamp unit 200, scatter plate 300 and chassis 500.Lamp unit 200 produces light.Scatter plate 300 be positioned at lamp unit 200 above, thereby scatter plate 300 can scattering from the lamp unit 200 light that produce.Chassis 500 holds scatter plate 300 and lamp unit 200.Backlight assembly 100 has otpical leaf 600 and reflection sheet 700.Otpical leaf 600 is positioned on the scatter plate 300.Otpical leaf 600 can improve the optical characteristics of light.Reflection sheet 700 is between lamp unit 200 and chassis 500.Reflection sheet 700 reflections are 200 light that penetrate from the lamp unit.In addition, reflection sheet 700 disperses 200 heats that produce from the lamp unit.
Reflection sheet 700 has reflection horizon 710 and adhesion layer 730.Adhesion layer 730 is between reflection horizon 710 and heat dissipating layer 720.Adhesion layer 730 is laminated to reflection horizon 710 with heat dissipating layer 720 basically.
Reflection horizon 710 can include but not limited to polyethylene terephthalate (PET).Heat dissipating layer 720 can include but not limited to have the material of high heat conductance and high resistivity.This material can be boron nitride (BN), silit (SiC) or magnesium oxide (MgO).These can use separately or use with the form of its potpourri.In optional embodiment, graphite can be doped in the material with predetermined concentration.Adhesion layer 730 can have the sicker 732 that has bubble 734 therein.Bubble 734 can randomize in sicker 732.
Reflection sheet 700 will reflex to reflection horizon 710 by 200 light that penetrate from the lamp unit, make light can incide on the scatter plate 300.The bubble 734 that is included in the adhesion layer 730 of reflection sheet 700 can scattered light, thereby can improve reflectivity.
In addition, reflection sheet 700 disperses first and second outer electrodes 214 and 216 heats that produce from lamp 212 equably.Then, reflection sheet 700 arrives chassis 500 with heat transferred.Therefore, can be so that distribute from first and second outer electrodes 214 and 216 heats that produce.
Display panel unit 800 comprises display panels 810, source electrode printed circuit board (PCB) 820 and gate pcb 830.Display panels 810 display images.Source electrode printed circuit board (PCB) 820 and gate pcb 830 provide drive signal to display panels 810.
Display panels 810 comprises thin film transistor (TFT) (TFT) plate 812, filter plate 814 and liquid crystal layer (not shown).Filter plate 814 can combine with TFT plate 812.Liquid crystal layer is between TFT plate 812 and filter plate 814.
In the exemplary embodiment, TFT plate 812 can be a transparency glass plate, and at least one TFT (not shown) is arranged with matrix shape basically therein.TFT is a kind of switchgear.The source terminal of TFT is connected with data line.The gate terminal of TFT is connected with gate line.The drain terminal of TFT transparently is connected with the pixel electrode of conductive material with having.
Filter plate 814 can be separated with TFT plate 812.In addition, filter plate 814 can be relative with TFT plate 812.In the exemplary embodiment, the rgb pixel (not shown) can be formed in the filter plate 814 by thin-film technique.When light passed rgb pixel, rgb pixel can present predetermined color.In a further exemplary embodiment, the common electrode with conductive material can be formed on the front surface of filter plate 814.
When the gate terminal to TFT provided electric energy, display panels 810 can be switched on.When display panels 810 is switched on, between pixel electrode and common electrode, form magnetic field.This magnetic field can make the liquid crystal molecule that is positioned at the liquid crystal layer between TFT plate 812 and the filter plate 814 rearrange.When liquid crystal molecule was rearranged by magnetic field, the optical transmission rate that is provided to liquid crystal layer from backlight assembly 100 can change according to rearranging of liquid crystal molecule.Advantageously, display panels 810 can show desired images effectively.
The drive signal that provides from source electrode printed circuit board (PCB) 820 and gate pcb 830 can be applied to display panels 810 by data flexible circuit film 825 and grid flexible circuit film 835.Data flexible circuit film 825 can include but not limited to that band carries encapsulation (TCP) or membrane of flip chip encapsulation (COF).Grid flexible circuit film 835 can include but not limited to that band carries encapsulation or membrane of flip chip encapsulation.Data flexible circuit film 825 and grid flexible circuit film 835 can have data driving chip 840 and grid drive chip 850 respectively.Data driving chip 840 and grid drive chip 850 can will be applied to display panels 810 from the drive signal that source electrode printed circuit board (PCB) 820 and gate pcb 830 provide in the required time.
Display unit 800 is installed on the back light unit 100.Display panels 810 is contained in the cope framework 950.The display panels 810 that is contained in the model framework 950 is positioned on the backlight assembly 100.Crooked data flexible circuit film 825, thus source electrode printed circuit board (PCB) 820 is fixed on the back side on chassis 500.
Take over a business the edge part of 900 encirclement backlight assemblies 100, make that 900 can combine with chassis 500.Taking over a business 900 can prevent or reduce display panels 810 effectively owing to the damage that produces of collision.In addition, taking over a business 900 can be fixed on this place with display panels 810, thus display panels 810 can with the minimum interval remain on chassis 500 near.
In exemplary embodiment according to the present invention, backlight assembly has the reflecting plate of the material that comprises high heat conductance and high resistivity.Reflection sheet has reflection horizon, heat dissipating layer and adhesion layer.Heat dissipating layer can comprise boron nitride (BN), silit (SiC), magnesium oxide (MgO) or its any mixture.
Advantageously, the heat that produces from lamp is disperseed equably, thereby can reduce the temperature difference between second electrode part of first electrode part of lamp and lamp.The voltage that is applied to first electrode part is basically greater than the voltage that is applied to second pixel portions.The Luminance Distribution of liquid crystal indicator can be uniform.
In addition, reflection sheet is heat dispersing promptly, makes the heat that produces from lamp can promptly be delivered to the chassis.Another advantage is that reflection sheet can suppress or reduce effectively the rising of the internal temperature of backlight assembly.In addition, can keep the brightness of lamp or brightness only to reduce slightly.In addition, can improve the display quality of liquid crystal indicator.
Reflection sheet makes lamp and chassis insulation to be minimized by the stray capacitance that leakage current caused.Advantageously, can prevent or reduce effectively the reduction of the brightness of the backlight assembly that causes owing to leakage current.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (24)

1. reflection sheet comprises:
The reflection horizon is used to reflect the light that provides from light source; And
Heat dissipating layer is positioned at least one surface in described reflection horizon, and described heat dissipating layer disperses to leak from the heat of described light source and the electric current that suppresses described light source.
2. reflection sheet according to claim 1, wherein, described heat dissipating layer comprises the thermal conductivity that is not less than about 200W/mK and comprises and be not less than about 10 14The material of the resistivity of ohmcm.
3. reflection sheet according to claim 1, wherein, described heat dissipating layer comprises boron nitride, silit, magnesium oxide and comprises a kind of at least a potpourri of above-mentioned substance.
4. reflection sheet according to claim 1, wherein, described heat dissipating layer comprise the graphite that is doped with no more than about 30% percentage by weight boron nitride, be doped with the graphite of no more than about 30% percentage by weight silit, be doped with no more than about 30% percentage by weight graphite magnesium oxide and comprise a kind of at least a potpourri of above-mentioned substance.
5. reflection sheet according to claim 1 also comprises the adhesion layer between described heat dissipating layer and described reflection horizon, and described adhesion layer is bonded to each other described heat dissipating layer and described reflection horizon.
6. reflection sheet according to claim 5, wherein, described adhesion layer comprises sicker, described sicker is included in the bubble of randomize in the described adhesion layer.
7. reflection sheet according to claim 1, wherein, described reflection horizon comprises polyethylene terephthalate.
8. reflection sheet according to claim 1, wherein, described heat dissipating layer be positioned at described reflection horizon lower surface below.
9. reflection sheet according to claim 1, wherein, described reflection horizon comprises first thickness, and described heat dissipating layer comprises second thickness greater than described first thickness.
10. reflection sheet according to claim 9, wherein, described first thickness is about 0.25mm and described second thickness is about 0.75mm.
11. a backlight assembly comprises:
Light source is used to produce light;
Receiving member, be positioned at described light source below, be used to hold described light source; And
Reflecting element, between described light source and described receiving member, described reflecting element is used to distribute from the heat of described light source generation and with described light source and the insulation of described receiving member.
12. backlight assembly according to claim 11, wherein, described reflecting element comprises: the reflection horizon is used to reflect described light; And
Heat dissipating layer is formed on the surface in described reflection horizon, and described heat dissipating layer is used to disperse from the heat of described light source and suppresses the leakage current of described light source.
13. backlight assembly according to claim 12, wherein, described heat dissipating layer comprises boron nitride, silit, magnesium oxide and comprises a kind of at least a potpourri of above-mentioned substance.
14. backlight assembly according to claim 12, wherein, described heat dissipating layer comprise the graphite that is doped with no more than about 30% percentage by weight boron nitride, be doped with the graphite of no more than about 30% percentage by weight silit, be doped with no more than about 30% percentage by weight graphite magnesium oxide and comprise a kind of at least a potpourri of above-mentioned substance.
15. backlight assembly according to claim 12 also comprises the adhesion layer that is formed between described heat dissipating layer and the described reflection horizon, described adhesion layer is with described heat dissipating layer and the combination of described reflection horizon.
16. backlight assembly according to claim 15, wherein, described adhesion layer comprises sicker, and described sicker is included in the bubble of randomize in the described adhesion layer.
17. backlight assembly according to claim 11, wherein, described receiving member comprises the chassis, and described chassis comprises metal.
18. a display device comprises:
Display unit is used for display image; And
Backlight assembly, comprise light source, first receiving member and reflecting element, described light source is used to produce the light that is used to show described image, described first receiving member is used to hold described light source, and described reflecting element is used to distribute from the heat of described light source generation and with described light source and the insulation of described first receiving member.
19. display device according to claim 18, wherein, described reflecting element comprises:
The reflection horizon is used to reflect described light; And
Heat dissipating layer is formed on the surface in described reflection horizon, and described heat dissipating layer is used to disperse leak from the heat of described light source and the electric current that suppresses described light source.
20. display device according to claim 19, wherein, described reflecting element comprises adhesion layer, and described adhesion layer is between described heat dissipating layer and described reflection horizon, with described heat dissipating layer and the combination of described reflection horizon.
21. display device according to claim 18, wherein, described backlight assembly also comprises:
Diffuser, be positioned at described light source above; And
Second receiving member is positioned at the following of described diffuser and contacts with described first receiving member.
22. display device according to claim 21, wherein, described second receiving member comprises first frame unit, and described first frame unit comprises the scalariform portion that holds first spatial accommodation of described light source and be used to support described diffuser of being used to.
23. display device according to claim 22, wherein, described second receiving member comprises second frame unit, and described second frame unit comprises the scalariform portion that holds second spatial accommodation of described light source and be used to support described diffuser of being used to.
24. display device according to claim 18 also comprises:
Printed circuit board (PCB) and flexible circuit film, wherein, described flexible circuit film is set up, and is used for described printed circuit board (PCB) is fixed to the bottom surface of described first receiving member.
CNA2005101149601A 2004-11-16 2005-11-16 Reflection sheet, backlight assembly and display device Pending CN1776495A (en)

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